The class A gain stage sounds like no other design we've done. It's big, yet open and full of life. Just about any parameter of the sound is changeable including the abaility to change both the Feedback and Bias of the amp. The Feedback control increases the harmonics thousands of times over the range of the control. the range of clipping and distortion also changes and ranges from soft Class A clipping to super soft gushy tube type. the sounds range from a very colored and "overbiased" tone to a gently colored and "in your face" tone.